1. Beam Line Alignment Richard Catherall EN-STI
ISOLDE Technical Coordinator
ISCC meeting 28th June 2016

2. ISOLDE Lines - Survey Results
Measurements of
November/December 2012
Isolde Lines Survey Results – meeting

3. Isolde Lines Survey Results – meeting 15.01.2013
RESULTS – vertical plane
~ 10mm step
Zavg = m
Dev: -1.5mm to +1.5mm
Zavg = m
Dev: -1.8mm to +1.1mm
Isolde Lines Survey Results – meeting

4. Isolde Lines Survey Results – meeting 15.01.2013
RESULTS – vertical plane
Isolde Lines Survey Results – meeting

5. RESULTS – horizontal plane main line CA0 – CD0
Line: CA0-CB0-CC0-CD0
Bearing [g]:
Name
X [m]
Y [m]
Distance
to line [mm]
CA0_Q_E
-0.1
CA0_Q_S
-1.1
CB0_Q1_E
-0.6
CB0_Q1_S
0.1
CB0_Q2_E
1.4
CB0_Q2_S
0.9
CC0_Q1_E
0.2
CC0_Q1_S
1.2
CC0_Q2_E
0.0
CC0_Q2_S
-0.7
CD0_Q1_E
-0.3
CD0_Q1_S
-0.9
Deviation scale 500:1
Relatively to the scale along the beam
Isolde Lines Survey Results – meeting

6. RESULTS – horizontal plane bearings comparison
Line
Theoretical
Bearing
Calculated
Difference
Calc-Theo
[g]
[cc]
CA0-CB0-CC0-CD0
-116
LA1
409
LA2
315
LA0-LA3
-244
LC0
-202
RA0 83
RB0
-311
RC0-RC2-RC6
-69
RC3
-229
RC4
-235
10cc ~ 0.16 mm/10m
+409cc
Theoreticl Bearing
Calculated Bearing
+315cc
-244cc
-116cc
+83cc
-202cc
LC0

7. MADX simulations Distorted beam line without correction
Distorted beam line with correction

8. MADX simulations summary
The result of this study shows that the transmission of the transfer lines can be recovered by using the correction power of the available steering quadrupoles.
This is a rather fortunate situation because a misalignment in the horizontal direction would have been more difficult to handle due to the fact that the horizontal apertures of the elements are smaller.
After tuning for 8 hours, one could achieve a transmission from CA0 to RC4 of around 80% to 90% (at 50kV).
Acceptance study of the ISOLDE beam lines with MAD-X
E.Rapisarda, M.A. Fraser, J. Kurcewicz, D. Voulot